Laminated ceramic capacitor

Abstract

Better high-temperature load characteristics are obtained in a laminated ceramic capacitor including a dielectric ceramic layer with a thickness of 1 μm or less. The laminated ceramic capacitor includes a plurality of stacked dielectric ceramic layers, a plurality of internal electrode layers, each disposed between dielectric ceramic layers, and external electrodes that are electrically connected to internal electrode layers. In this laminated ceramic capacitor, when the thickness of each dielectric ceramic layer is denoted by tc and the thickness of each internal electrode layer is denoted by te, tc is 1 μm or less, and tc/te is equal to or less than 1.

1. A laminated ceramic capacitor comprising:
 a plurality of stacked dielectric ceramic layers; 
 a plurality of internal electrode layers, each of which is disposed between adjacent dielectric ceramic layers; and 
 a pair of external electrodes electrically connected to different ones of the plurality of internal electrode layers, 
 wherein when the average thickness of each dielectric ceramic layer sandwiched between a pair of internal electrodes is tc, the thickness of each internal electrode layer is te, tc is 1 μm or less, and tc/te is equal to or less than 1. 
 
     
     
       2. The laminated ceramic capacitor according to  claim 1 , wherein the dielectric ceramic in the dielectric ceramic layers is a barium titanate based compound and contains vanadium as an accessory constituent. 
     
     
       3. The laminated ceramic capacitor according to  claim 2 , wherein the content of the vanadium with respect to 100 parts by mol of the main constituent is 0.02 to 0.20 parts by mol. 
     
     
       4. The laminated ceramic capacitor according to  claim 3 , wherein the internal electrode layers comprise nickel. 
     
     
       5. The laminated ceramic capacitor according to  claim 4 , wherein the barium titanate based compound is of the formula ABO 3  where A is Ba, and up to 15 mol % of each of Ca and Sr, and B is Ti, and up to 15 mol % of each of Zr and Hf. 
     
     
       6. The laminated ceramic capacitor according to  claim 5 , wherein the barium titanate based compound is BaTiO 3 . 
     
     
       7. The laminated ceramic capacitor according to  claim 6 , wherein tc is less than 1 μm, and tc/te is less than 1. 
     
     
       8. The laminated ceramic capacitor according to  claim 2 , wherein the internal electrode layers comprise nickel. 
     
     
       9. The laminated ceramic capacitor according to  claim 8 , wherein the barium titanate based compound is of the formula ABO 3  where A is Ba, and up to 15 mol % of each of Ca and Sr, and B is Ti, and up to 15 mol % of each of Zr and Hf. 
     
     
       10. The laminated ceramic capacitor according to  claim 9 , wherein the barium titanate based compound is BaTiO 3 . 
     
     
       11. The laminated ceramic capacitor according to  claim 10 , wherein tc is less than 1 μm, and tc/te is less than 1. 
     
     
       12. The laminated ceramic capacitor according to  claim 1 , wherein the internal electrode layers comprise nickel. 
     
     
       13. The laminated ceramic capacitor according to  claim 12 , wherein the barium titanate based compound is of the formula ABO 3  where A is Ba, and up to 15 mol % of each of Ca and Sr, and B is Ti, and up to 15 mol % of each of Zr and Hf. 
     
     
       14. The laminated ceramic capacitor according to  claim 13 , wherein the barium titanate based compound is BaTiO 3 . 
     
     
       15. The laminated ceramic capacitor according to  claim 14 , wherein tc is less than 1 μm, and tc/te is less than 1. 
     
     
       16. The laminated ceramic capacitor according to  claim 1 , wherein the barium titanate based compound is of the formula ABO 3  where A is Ba, and up to 15 mol % of each of Ca and Sr, and B is Ti, and up to 15 mol % of each of Zr and Hf. 
     
     
       17. The laminated ceramic capacitor according to  claim 16 , wherein the barium titanate based compound is BaTiO 3 . 
     
     
       18. The laminated ceramic capacitor according to  claim 17 , wherein tc is less than 1 μm, and tc/te is less than 1. 
     
     
       19. The laminated ceramic capacitor according to  claim 1 , wherein tc is less than 1 μm, and tc/te is less than 1. 
     
     
       20. The laminated ceramic capacitor according to  claim 1 , wherein tc is 0.5 μm or less.